Abrading tool



Dec. 24, 135. F gcggs ET AL 2,@25,E25

ABRADING TOOL Filed June 12, 1954 Patented Dec. 24, 1935 UNITED STATES PATENT OFFICE ABRADING TOOL Jersey Application June 12, 1934, Serial No. 730,220 In Great Britain July 29, 1933 '2 Claims. (o1. 51-494) This invention relates to abrading tools and is herein disclosed as embodied in two abradin tools of types commonly used in bufiing shoes.

It is an object of this invention to provide an improved bufling tool in which the leading end of the abrasive cover is prevented from striking against the work, while at the same time the cover may readily be detached when worn and replaced by a new one.

In accordance with a feature of the invention the abrasive cover is secured upon the tool body with the ends of the abrasive cover approximately in abutting relation and Without overlapping, one of the ends of the abrasive cover being slightly sunk into the tool body below the opposite end to enable the sunk end, which when the tool is operated will be the leading end, to avoid striking the work. In each of the illustrated tools,

the tool body is rotatable and is shaped to support the leading end of the abrasive cover at a less distance from the axis of the tool than the trailing end. In order to provide-for the convenient attachment and replacement of abrasive covers upon tool bodies thus formed, the invention further contemplates the use of an abrasive cover which upon its non-abrasive surface is coated with a permanently tacky .adhesive for securing the cover directly to its supporting means.

With the above and other objects and features in view, the invention will now be described with reference to the accompanying drawing and pointed out in the claims.

In the drawing,

Fig. 1 is an elevational view partly in section of an improved tool;

Fig. 2 is a perspective view of a molded abrasive cover for use upon the tool shown in Fig. 1;

Fig. 3 is a view partly in section-of a different form of tool;

Fig. 4 is a sectional view to an enlarged scale taken on the line IVIV of Fig. 3; and

Fig. 5 is a plan view of the abrasive cover of the tool shown in Fig. 3.

The tool shown in Fig. 1 is of the non-inflated Naumkeag type of relatively large diameter, about five inches as compared to the usual diameter of about 3 inches, and is intended to be rotated in the direction shown by the arrow. The tool is provided with the usual pad 3 of dense felt which is secured upon a metal disk 5 carried by a spindle I. As shown in Fig. 1, the pad 3 is wedge-shaped in radial section at its peripheral portion. The abrasive element comprises a cover 9 of abrasive sheet material formed of a band or strip of abrasive cloth which is molded before application to the pad into the form shown in Fig. 2 so as to have sharply defined faces which provide annular marginal abrasive surfaces on the opposite faces of the pad. The abrasive element is thus given an inherent shape similar to that of the peripheral portion of the tool body. While the molding operation may be performed on cloth before the cloth is coated with abrasive,

it is preferable to mold the cloth after it has been coated with abrasive. In molding abrasive covered cloth, the cloth preferably should have a twill weave, and the strip to be molded should be cut on the bias, as indicated at 10 in Fig. 2. Such an abrasive cover is preferably attached to the pad by an adhesive which provides a bond adequate during the operation of the tool but which conveniently can be broken when the cover is worn and when replacement of the cover is desirable. For example, before or after the molding of the cover, the non-abrasive surface of the cover is provided with a coating l2 of an adhesive composition adapted to act as does that used in surgical or other adhesive tape, which coating will enable the abrasive cover to be attached to the pad by relatively light pressure and to cling to the pad with considerable tenacity, thereby resisting displacement by the forces applied to it during use, while at the same time enabling the cover readily to be removed, owing to the permanently tacky condition of the adhesive, by sim- 3o ply pulling 01f the cover. If the ends indicated at H of the cover were merely butted together upon the surface of the pad, the leading end of the cover would be likely to be loosened in striking against the work as the tool rotates. It is therefore preferable, as in the illustrated construction, to sink the leading end of the abrasive cover into the pad somewhat below the level of the trailing end. This is accomplished by providing a recess in the pad which recess has a wall 30 extending inwardly to form an abrupt shoulder and another wall l3 which slopes gradually outward from the base of the shoulder. When the cover is applied to the pad, the leading end of the cover will lie within the recess while the trailing end will terminate at the shoulder and will thus be slightly above the level of the leading end.

In Figs. 3 and 4 is shown a frusto-conical heelbreast scouring tool having an abrasive cover I9 mounted upon a felt pad l5 which is carried by a spindle IT. The direction of rotation of the frusto-conical tool is indicated by arrows in Figs.

3 and 4. The cover l9 consists of a strip of abrasive sheet material wrapped spirally about the u tool body with the edges of the strip approximately in abutting relation to each other and with the leading edge 23 of the strip slightly sunk at the free end of the tool, as shown in Fig. 4, below the level of the trailing edge 3|. The felt pad I5 is recessed at the free end of the tool to provide a relatively abrupt shoulder along a spiral line that coincides substantially with the edges of the abrasive strip. From the base of the shoulder the recess slopes gradually outward, and the leading edge 23 lies within the recess. The strip 19 is secured to the pad I5 by a coating 2| of permanently tacky adhesive of the same nature as that used in the tool illustrated in Figs. 1 and 2.

Having described the invention, what is claimed as new and desired to be secured by Letters Patent of the United States is:

1. An abrading tool comprising a tool body and an abrasive cover secured upon said tool body with the ends of the abrasive cover approximately 'in abutting relation without overlapping, one of the ends of the abrasive cover being slightly sunk into the tool body below the opposite end to enable the sunk end, which when the tool is operated will be the leading end, to avoid striking the work.

2. An abrading tool comprising a tool body, and an abrasive cover secured directly to said tool body by a permanently tacky adhesive with the ends of the cover approximately in abutting re-. lation without overlapping, one of the ends of the abrasive cover being slightly sunk into the tool body below the opposite end to enable the sunk end, which when the tool is operated will be the leading end, to avoid striking the work.

3. An abrading tool comprising a rotary tool body in the form of a disk, the peripheral por- 4. An abrading tool comprising a rotary tool body in the form of a disk, the peripheral portion of which disk is wedge shaped in radial section, and an abrasive cover in the form of a strip of abrasive cloth cut on the bias relatively to the 5 Weave of the cloth and molded to fit over the periphery of said tool body and adhesively secured thereto.

5. An abrading tool comprising a rotary tool body in the form of a disk, the peripheral por- 10 tion of which disk is wedge shaped in radial section, and an abrasive cover adhesively secured about the periphery of said tool body with the ends of said cover approximately in abutting relation without overlapping, one end of the abra- 15 I sive cover, which when the tool is rotated, will be the leading end, being slightly closer to the axis of the tool body than the opposite end to avoid striking the work.

6. A rotary abrading tool comprising a frustoconical tool body, and a strip of abrasive sheet material wrapped spirally about said tool body and secured thereto by an adhesive with the edges of the abrasive strip approximately in abut- 26 ting relation without overlapping, one of the edges of the abrasive strip being slightly sunk into the tool body below the opposite edge to enable the sunk edge, which when the tool is rotated will be the leading edge, to avoid striking the 30 Work.

7. An abrading tool body having formed in its operating surface a recess, one wall of the recess extending inwardly to form an abrupt shoulder? and the other wall sloping gradually outward from the base of said shoulder, said recess serving to receive the leading end of an abrasive cover on said tool body and to prevent it from striking the work.

FRED RICKS. ERNEST HOPE. 

